N, P and K input by irrigation water into paddy fields of Fukuoka prefecture [Japan]
2001
Mizuta, K. (Fukuoka-ken. Agricultural Research Center, Chikushino (Japan))
N, P and K input into paddy fields from irrigation water in Fukuoka Prefecture were estimated from the data of N, P and K content in irrigation water*reported amount of irrigation water. Total N input was 21-30 kg/ha. The variation among regions was large and total N input in Chikugo was larger than in other regions. Total N input after booting was 10kg/ha. Inorganic N input throughout the cultivation period was 11-15kg/ha and that after booting was 5kg/ha. Input of total P throughout the cultivation period was 1.5-2.2kg/ha and that of PO4-P was 0.8-1.2kg/ha. K input was 29-42 kg/ha.
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